// Copyright (C) Kumo inc. and its affiliates.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//


#pragma once

#include <melon/hash/checksum.h>

namespace kumo::pollux::bits {
    // A boost compatible CRC32 calculator.
    class Crc32 {
    public:
        void process_bytes(const void *data, int32_t size) {
            checksum_ =
                    melon::crc32(reinterpret_cast<const uint8_t *>(data), size, checksum_);
        }

        uint32_t checksum() const {
            return ~checksum_;
        }

        void reset() {
            checksum_ = ~0U;
        }

    private:
        uint32_t checksum_{~0U};
    };
} // namespace kumo::pollux::bits
